/*
Copyright 2009 Johan Maasing, Mikael Forsberg

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.google.code.pj2r.sample.simple.dao;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;

public class StuffDAO {

    private static final StuffDAO instance = new StuffDAO();
    private ArrayList<StuffEntity> items = new ArrayList<StuffEntity>();

    public static StuffDAO getInstance() {
        return instance;
    }

    public synchronized List<StuffEntity> getAll() {
        return Collections.unmodifiableList(items);
    }

    public synchronized void add(StuffEntity s) {
        items.add(s);
    }

    public synchronized StuffEntity get(String id) {
        ListIterator<StuffEntity> iterator = items.listIterator();
        while (iterator.hasNext()) {
            StuffEntity s = iterator.next();
            if (s.getId().equals(id)) {
                return s;
            }
        }
        return null;
    }

    public synchronized void delete(String id) {
        StuffEntity entity = get(id);
        if (entity != null) {
            items.remove(entity);
        }
    }
}
